Paper clamp for dial recorders



Feb- 1931' c. E. LARRABEE 1, 91,761

PAPER CLAMP FOR DIAL RECORDERS Filed June 26, 1928 +4 FIGJ. ak- )8 2|-- Patented Feb. 10, 1931 UNITED STATES PATENT OFFICE CLINTON E. LAB-RABBI, OF BINGHAI'ION, NEW YORK, ABHGNOR TO INTERNATIONAL 'rmn RECORDING COMPANY OF NEW YORK, OF mmrco'r'r, NEW YORK, A CORPO- BATION OF NEW YORK PAPER CLAMP FOB DIAL BECOBDEBS Application flied June 88, 1828. Serial Io. 888,414.

This invention relates to paper clamps and more particularly to paper clamps for clam receiving arrival and departure registrations of employees.

In the type of time recorder known as a dial recorder a record receiving sheet is placed around the periphery of a rotatable drum to receive registrations from a printing mechanism in the machine. This record receiving sheet is generally ruled so that the rulings lie axially with the drum, said rulings being spaced to receive registrations between the lines and the spaces between the lines being numbered arbitrarily to correspond to numbers assigned to the different employees so that each employee registers in the space numbered corres onding to his own.

The record sheets are removed when filled with registrations and a new one put in place. This change mi ht be every day, every two days or once eac week according to the type of recorder used.

An object of this invention therefore is to provide new and improved means for clamping a record receiving sheet in printing position on a platen.

Another object is to provide a single member for clamping two ends of a record sheet in printing position on a platen.

Another object is to provide a single member for clamping opposite ends of a sheet of material on a drum.

Another object is to provide a single member for clamping opposite ends of a record receiving sheet on a cylindrical platen.

Other objects and advantages of this invention will be apparent from the specifications and the accompanying drawings which show one embodiment of this invention and wherein similar reference numerals indicate similar parts and wherein in the drawings:

Fig. 1 shows a side elevation of the clamp member in clamping position;

- Fig. 2 is a section on line 22 of Fig. 1;

Fig. 3 is a section on line 3-3 of Fig. 1

l a I a 7 Fig. 4 IS a section on line 44- of Fig.

Fig. 5 isa detail sectional view of the plate fastening means.

In Fig. 1 the illustration shows a drum such as is used on a dial type dial recorder. The drum consists of a frame 6 fixed to a shaft 7 and having around its peripher a printing platen 8 of suitable material. he drum frame 6 is fixed to the shaft 7 by means of screws 9 passin g through a collar 10 integral with the she. 7.

In the periphery of the frame and running axially with the drum is an open groove 11 (see Figs. 1 and 3) having its upper parallel edges beveled. Coacting with said groove is a bar-like member 12 having a hooked member 13 at one end and integral with said bar and at the other end a rojection 14 also integral with said bar, said projection having its upper edge flat and its lower edge curved.

A plate 28 is mounted to the drum frame by screws 15 on the left hand end of the drum as viewed in Fig 1. Said plate covers the end of the groove 11 and has a hole 16 adapted to receive the hook portion 13 (see Fig. 4). At the right hand end of the drum as viewed in Fig. 1 is a block 17 mounted in the recessed portion of the drum frame and fixed in position by the screws 18. Fixed to the block by means of studs 19 is a plate 20 (see Figs. 1 and 2). Said studs roject through from the back of the block 1 and are provided with large heads 21 which are housed in a recess 22. A spring 23 under compression bears against the stud head 21 and the block 17, thusbiasing the plate 20 against the block 17. At the lower end of the plate 20 is a projection 24 which enters a recess 25 of the block 17 thus holding the plate 20 more rigidly in position. A hole 26 is provided in the plate 20 to receive the projection 14 and the upper edge of the plate is formed slightly away from the end of the drum to provide a finger grip to permit of moving the plate outward in order to release the bar 12.

The upper edge of the bar 12 is flanged outwardly on each side so that said edge is of greater width than the lower portion and edge (see Fig. 3). The under sides of the flanged portions are bevelled to correspond with the bevelled edges of the groove 11, so

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that when the bar 12 is inserted in groove- 11 the bevelled edges coincide.

To remove the bar 12, the spring pressed plate 20 is moved to the right as viewed in formed out portions at the top of the plate 20 and the frame 6 and prying said plate away from said frame. This moves the top of the hole 26 clear of the top of the projection 14 and an upward pressure of the thumb against said projection will lift the end of the bar 12 out of the groove 11 said bar pivotin about the inside of the hook-shaped mem r 13 bearing against the top edge of the hole 16 in the plate 28. After the projection 14 1s free of the plate 20 it is withdrawn from the hole 16 thus completely removing the bar 12 from the drum.

A record sheet 27 is now placed around the periphery of the drum 8 and the ends of said sheet are turned down into the groove 11 as shown in Fig. 3. The hook-shaped member 13 is reinserted into the hole 16 and the bar 12 swung back into the oove 11. The lower rounded edge of the pro ection 14 coacts with the outwardly formed upper edge of the plate 20 and cams said plate away from the drum frame 6 allowing said projection to slide down behind said plate until it comes opposite the hole 26 at which time the plate snaps back into position by the influence of the springs 23 and thereby locks the bar 12 in position;

The friction of the bar 12 against the record sheet 27 draws the paper smooth and h taut and when finally clamped in position the bevelled edges of the groove 11 cooperate with the bevelled edges on the under side or: the flanged portion of the bar 12 to finally clamp the ends of the record sheet tightly in position. These bevelled edges supply a further advantage in avoiding the necessity of bending the record sheet at an acute angle which would be the case if the edges were square. Bending the record sheet at an acute angle would tend to crease it and break the fibres thus making it liable to tear which liability is eliminated by the applicants invention.

While I have shown and described and pointed out the fundamental novel features of the invention as applied to a single modification, it will be understood that various omissions and substitutions and changes in the form and details of the device illustrated and in its operation may be made by those skilled in the art-without departing from the spirit of the invention. I intend to be limited therefore only as indicated by the scope of the following claims:

1. A printing platen comprising a cylindrical drum having a groove in its periphery,

member cooperating with said oove means extending transversely to sai member adjacent one end of said groove for freely releasably locking one end of said single member in position in said groove and dis laceable means. adjacent the other end 0 said groove for releasably lockin the other end of said single member in sai ove.

3. A sheet clamping device or a rinting v rum, a. groove -in the periphery of said drum, a

platen comprising a cylindrical plate having an aperture therein fixed to one end of said drum and another plate resiliently mounted on the other end of said drum, 0. single member cooperating with said groove, a projection on one end of said single member cooperating with the aperture in said first named late and means associated with the other end of said single member for moving said second named plate out of its path of travel when said single member is moved into clamping position.

4. A sheet clamping device for a. print ing platen comprising a cylindrical drum, a groove in the periphery of said drum, a plate aving an aperture therein fixed to one end of said drum and another plate having an aperture therein resiliently mounted on the other end of said drum, a single member co groove and another projection on the other end of said single member cooperating with the aperture of said second named plate to lock said other end of said single member in said groove.

5. A clamping device for fastening sheet material flush on the periphery of a platen comprising -a cylindrical platen having a longitudinal groove extending substantially the width thereof and having bevelled longitudinal edges, forming obtuse angles with the adjacent intersecting peripheral portions of the platen, a bar conforming to the configuration of the groove and of dimensions less than those of the groove by substantially twice the thickness of material to be clamped on the platen whereby the movement of the bar into the groove with the ends of a sheet inserted therein serves to tauten the sheet on the platen and thereafter hold it in place and means for releasably holding the bar in the groove with its exposed sur ace substantially flush with the surface of the platen. In testimony whereof I hereto afllx my signature.

CLINTON E. LARRABEE. 

